Implement testing using Foundry

.github/workflows/test.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  check:
+    strategy:
+      fail-fast: true
+
+    name: Foundry project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Show Forge version
+        run: |
+          forge --version
+
+      - name: Run Forge fmt
+        run: |
+          forge fmt --check
+        id: fmt
+
+      - name: Run Forge build
+        run: |
+          forge build --sizes
+        id: build
+
+      - name: Run Forge tests
+        run: |
+          forge test -vvv
+        id: test

.gitignore

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+# Compiler files
+cache/
+out/
+
+# Ignores development broadcast logs
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+
+# Docs
+docs/
+
+# Dotenv file
+.env

README.md

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+## Foundry
+
+**Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.**
+
+Foundry consists of:
+
+-   **Forge**: Ethereum testing framework (like Truffle, Hardhat and DappTools).
+-   **Cast**: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
+-   **Anvil**: Local Ethereum node, akin to Ganache, Hardhat Network.
+-   **Chisel**: Fast, utilitarian, and verbose solidity REPL.
+
+## Documentation
+
+https://book.getfoundry.sh/
+
+## Usage
+
+### Build
+
+```shell
+$ forge build
+```
+
+### Test
+
+```shell
+$ forge test
+```
+
+### Format
+
+```shell
+$ forge fmt
+```
+
+### Gas Snapshots
+
+```shell
+$ forge snapshot
+```
+
+### Anvil
+
+```shell
+$ anvil
+```
+
+### Deploy
+
+```shell
+$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>
+```
+
+### Cast
+
+```shell
+$ cast <subcommand>
+```
+
+### Help
+
+```shell
+$ forge --help
+$ anvil --help
+$ cast --help
+```

foundry.toml

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+[profile.default]
+src = "src"
+out = "out"
+libs = ["lib"]
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options

remappings.txt

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+forge-std/=lib/forge-std/src/
+@chainlink/=/node_modules/@chainlink
+@openzeppelin/=/node_modules/@openzeppelin
+@aave/=/node_modules/@aave

src/PaymentV1.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.19;
+
+import {IERC20} from "@chainlink/contracts-ccip/src/v0.8/vendor/openzeppelin-solidity/v4.8.0/contracts/token/ERC20/IERC20.sol";
+import {SafeERC20} from "@chainlink/contracts-ccip/src/v0.8/vendor/openzeppelin-solidity/v4.8.0/contracts/token/ERC20/utils/SafeERC20.sol";
+import {IPool} from "@aave/core-v3/contracts/interfaces/IPool.sol";
+
+contract USDCPayment {
+    using SafeERC20 for IERC20;
+
+    mapping(bytes32 => uint256) public s_transactions; // list of amounts per ID
+
+    IPool public immutable i_pool;
+    IERC20 public immutable i_usdc;
+
+    error AmountIsZero();
+    error TransferFailed();
+    error IncorrectTokenAmount();
+    error IncorrectAmountId();
+    error NotOwner();
+    error InvalidUsdcToken();
+
+    event ProposalOpened(bytes32 id, uint256 amount, address initiator);
+    event ProposalClosed(bytes32 id, address freelancer);
+
+    constructor(address _addressPool, address _usdcAddress) {
+        if (_usdcAddress == address(0)) revert InvalidUsdcToken();
+        i_pool = IPool(_addressPool);
+        i_usdc = IERC20(_usdcAddress);
+        i_usdc.safeApprove(_addressPool, type(uint256).max);
+    }
+
+    function openProposal(uint256 _amount) external {
+        if (_amount == 0) revert AmountIsZero();
+
+        if (!i_usdc.transferFrom(msg.sender, address(this), _amount)) {
+            revert TransferFailed();
+        }
+        bytes32 uniqueId = generateID(msg.sender, _amount);
+
+        s_transactions[uniqueId] = _amount;
+        i_pool.supply(address(i_usdc), _amount, address(this), 0);
+
+        emit ProposalOpened(uniqueId, _amount, msg.sender);
+    }
+
+    /// @param id Generated ID to ensure is caller is valid owner.
+    /// @param freelancer address of beneficiary for succesfull job or empty address in case of calling by client
+    function closeProposal(bytes32 id, address freelancer) external {
+        uint256 proposalAmount = s_transactions[id];
+        if (proposalAmount == 0) {
+            revert IncorrectAmountId();
+        }
+        delete s_transactions[id];
+
+        address receiver;
+        if (freelancer == address(0)) {
+            receiver = msg.sender;
+        } else {
+            receiver = freelancer;
+        }
+
+        emit ProposalClosed(id, freelancer);
+
+        i_pool.withdraw(address(i_usdc), proposalAmount, receiver);
+    }
+
+    function getBalance(address _tokenAddress) external view returns (uint256) {
+        return IERC20(_tokenAddress).balanceOf(address(this));
+    }
+
+    // generate unique Indetifier for cross-chain transaction
+    /// @param _beneficiary The address of the client.
+    function generateID(
+        address _beneficiary,
+        uint256 _amount
+    ) public view returns (bytes32) {
+        return
+            keccak256(abi.encodePacked(_beneficiary, _amount, block.timestamp));
+    }
+
+    receive() external payable {}
+}

src/interfaces/IComet.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.19;
+
+/**
+ * @title Compound's Comet Main Interface (without Ext)
+ * @notice An efficient monolithic money market protocol
+ * @author Compound
+ */
+abstract contract IComet {
+    error Absurd();
+    error AlreadyInitialized();
+    error BadAsset();
+    error BadDecimals();
+    error BadDiscount();
+    error BadMinimum();
+    error BadPrice();
+    error BorrowTooSmall();
+    error BorrowCFTooLarge();
+    error InsufficientReserves();
+    error LiquidateCFTooLarge();
+    error NoSelfTransfer();
+    error NotCollateralized();
+    error NotForSale();
+    error NotLiquidatable();
+    error Paused();
+    error SupplyCapExceeded();
+    error TimestampTooLarge();
+    error TooManyAssets();
+    error TooMuchSlippage();
+    error TransferInFailed();
+    error TransferOutFailed();
+    error Unauthorized();
+
+    event Supply(address indexed from, address indexed dst, uint amount);
+    event Transfer(address indexed from, address indexed to, uint amount);
+    event Withdraw(address indexed src, address indexed to, uint amount);
+
+    event SupplyCollateral(address indexed from, address indexed dst, address indexed asset, uint amount);
+    event TransferCollateral(address indexed from, address indexed to, address indexed asset, uint amount);
+    event WithdrawCollateral(address indexed src, address indexed to, address indexed asset, uint amount);
+
+    /// @notice Event emitted when a borrow position is absorbed by the protocol
+    event AbsorbDebt(address indexed absorber, address indexed borrower, uint basePaidOut, uint usdValue);
+
+    /// @notice Event emitted when a user's collateral is absorbed by the protocol
+    event AbsorbCollateral(address indexed absorber, address indexed borrower, address indexed asset, uint collateralAbsorbed, uint usdValue);
+
+    /// @notice Event emitted when a collateral asset is purchased from the protocol
+    event BuyCollateral(address indexed buyer, address indexed asset, uint baseAmount, uint collateralAmount);
+
+    /// @notice Event emitted when an action is paused/unpaused
+    event PauseAction(bool supplyPaused, bool transferPaused, bool withdrawPaused, bool absorbPaused, bool buyPaused);
+
+    /// @notice Event emitted when reserves are withdrawn by the governor
+    event WithdrawReserves(address indexed to, uint amount);
+
+    function supply(address asset, uint amount) virtual external;
+    function supplyTo(address dst, address asset, uint amount) virtual external;
+    function supplyFrom(address from, address dst, address asset, uint amount) virtual external;
+
+    function transfer(address dst, uint amount) virtual external returns (bool);
+    function transferFrom(address src, address dst, uint amount) virtual external returns (bool);
+
+    function transferAsset(address dst, address asset, uint amount) virtual external;
+    function transferAssetFrom(address src, address dst, address asset, uint amount) virtual external;
+
+    function withdraw(address asset, uint amount) virtual external;
+    function withdrawTo(address to, address asset, uint amount) virtual external;
+    function withdrawFrom(address src, address to, address asset, uint amount) virtual external;
+
+    function approveThis(address manager, address asset, uint amount) virtual external;
+    function withdrawReserves(address to, uint amount) virtual external;
+
+    function absorb(address absorber, address[] calldata accounts) virtual external;
+    function buyCollateral(address asset, uint minAmount, uint baseAmount, address recipient) virtual external;
+    function quoteCollateral(address asset, uint baseAmount) virtual public view returns (uint);
+
+    function getCollateralReserves(address asset) virtual public view returns (uint);
+    function getReserves() virtual public view returns (int);
+    function getPrice(address priceFeed) virtual public view returns (uint);
+
+    function isBorrowCollateralized(address account) virtual public view returns (bool);
+    function isLiquidatable(address account) virtual public view returns (bool);
+
+    function totalSupply() virtual external view returns (uint256);
+    function totalBorrow() virtual external view returns (uint256);
+    function balanceOf(address owner) virtual public view returns (uint256);
+    function borrowBalanceOf(address account) virtual public view returns (uint256);
+
+    function pause(bool supplyPaused, bool transferPaused, bool withdrawPaused, bool absorbPaused, bool buyPaused) virtual external;
+    function isSupplyPaused() virtual public view returns (bool);
+    function isTransferPaused() virtual public view returns (bool);
+    function isWithdrawPaused() virtual public view returns (bool);
+    function isAbsorbPaused() virtual public view returns (bool);
+    function isBuyPaused() virtual public view returns (bool);
+
+    function accrueAccount(address account) virtual external;
+    function getSupplyRate(uint utilization) virtual public view returns (uint64);
+    function getBorrowRate(uint utilization) virtual public view returns (uint64);
+    function getUtilization() virtual public view returns (uint);
+
+    function governor() virtual external view returns (address);
+    function pauseGuardian() virtual external view returns (address);
+    function baseToken() virtual external view returns (address);
+    function baseTokenPriceFeed() virtual external view returns (address);
+    function extensionDelegate() virtual external view returns (address);
+
+    /// @dev uint64
+    function supplyKink() virtual external view returns (uint);
+    /// @dev uint64
+    function supplyPerSecondInterestRateSlopeLow() virtual external view returns (uint);
+    /// @dev uint64
+    function supplyPerSecondInterestRateSlopeHigh() virtual external view returns (uint);
+    /// @dev uint64
+    function supplyPerSecondInterestRateBase() virtual external view returns (uint);
+    /// @dev uint64
+    function borrowKink() virtual external view returns (uint);
+    /// @dev uint64
+    function borrowPerSecondInterestRateSlopeLow() virtual external view returns (uint);
+    /// @dev uint64
+    function borrowPerSecondInterestRateSlopeHigh() virtual external view returns (uint);
+    /// @dev uint64
+    function borrowPerSecondInterestRateBase() virtual external view returns (uint);
+    /// @dev uint64
+    function storeFrontPriceFactor() virtual external view returns (uint);
+
+    /// @dev uint64
+    function baseScale() virtual external view returns (uint);
+    /// @dev uint64
+    function trackingIndexScale() virtual external view returns (uint);
+
+    /// @dev uint64
+    function baseTrackingSupplySpeed() virtual external view returns (uint);
+    /// @dev uint64
+    function baseTrackingBorrowSpeed() virtual external view returns (uint);
+    /// @dev uint104
+    function baseMinForRewards() virtual external view returns (uint);
+    /// @dev uint104
+    function baseBorrowMin() virtual external view returns (uint);
+    /// @dev uint104
+    function targetReserves() virtual external view returns (uint);
+
+    function numAssets() virtual external view returns (uint8);
+    function decimals() virtual external view returns (uint8);
+
+    function initializeStorage() virtual external;
+}

src/interfaces/IUSDC.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.19;
+
+interface IUSDC {
+    function balanceOf(address account) external view returns (uint256);
+    function mint(address to, uint256 amount) external;
+    function configureMinter(
+        address minter,
+        uint256 minterAllowedAmount
+    ) external;
+    function masterMinter() external view returns (address);
+}